Dolphin 'smiles' may truly be a sign of playfulness
Captive dolphins are more likely to make an open-mouthed expression when their playmate can see them and they often reciprocate, hinting that it is a form of visual communication
Captive dolphins are more likely to make an open-mouthed expression when their playmate can see them and they often reciprocate, hinting that it is a form of visual communication
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